<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div{line-height: 100px;
			text-align: center;
			font-size: 48px;
			color: aliceblue;
			border: 5px solid black;
				}
				.div1{background-color: deeppink;
				display: none;}
				.div2{background-color: black;
				opacity: 0;}
				.div3{background-color: purple;
				visibility: hidden;
				transition: all 1s;}
				
				.div2:hover+.div3{visibility: visible;}
		</style>
	</head>
	<body>
		<div class="div1">我是div1</div>
		<div class="div2">我是div2</div>
		<div class="div3">我是div3</div>
		
		
		<style type="text/css">
			h1{
				width: 200px;
				height: 200px;
				background-color: aquamarine;
				text-align: center;
				transition: all 0.5s cubic-bezier(0,1.95,.67,1.95);
			}
			
			h1:hover{
				width: 600px;
			}
		</style>
		<h1>hhhhhhh </h1>
	</body>
</html>
